Main memory management is explained below
Main memory is a huge array of words or bytes (called as memory locations), ranging in size from hundreds of thousands to billions. Each and every word or byte has its own address. Main memory is a repository of quickly reachable data shared by the CPU and I/O devices. It comprises the stack, code, data, and other parts of the process. The central processor reads instructions of a process from chief memory during the machine cycle- fetch-decode-execute.
The OS is responsible for the below written activities in the connection with memory management:
Keeping track of the free memory space
Keeping track of which parts of the memory are presently being used and by whom
Deciding which processes are to be loaded into the memory when memory space becomes available
Deciding how much memory is to be given to a process
Allocating and deallocating memory space as required
Insuring that a process is not overwritten on another
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